WotC dropped investigate in TLA partly to cut down on the number of keywords in the set and partly to align Clues with the way other predefined tokens (Treasure, Food, etc.) are used
Tribal Ramp Just like our lands, since we're a 5C deck we'll need to lean heavily on mana-fixing options so we can consistently cast our spells
*Oh yeah, Tergrid has an entire other card on the backside (Tergrid's Lantern) but honestly, that part is fine
It has the potential to destroy a ton of creatures on the battlefield, so long as they have equal toughness to each other
Icetill Explorer is the complete package, allowing you to play two lands a turn, play lands from your graveyard, and mill them from your library
We want to put some more emphasis on the long-term value of the flurry ability by increasing Xho Cai's resilience, putting the card closer in line with Mardu Thunderkite